Quasi-newton based Kalman filter channel estimation for OFDM systems

In this paper, Kalman filter method has been used for the estimate of time variant channels in OFDM systems. The estimation is based on comb- type pilot in frequency domain. The channel coefficients that belong to the pilot subcarriers are estimated by Kalman filter. To reduce complexity, quasi-Newton methods are adapted for updating the gain of Kalman filter. Then, we can estimate channel parameter except for the inverse matrix which needs high complexity by using quasi-Newton methods.